feat: add aggregate argument to cppad_trace_graph_objective function

Author: eminyouskn

lib/cppad_interface_ext.cpp

@@ -183,6 +183,6 @@ NB_MODULE(cppad_interface_ext, m)
 	    .def_ro("hessian", &CppADAutodiffGraph::hessian_graph);
 
 	m.def("cppad_trace_graph_constraints", cppad_trace_graph_constraints);
-	m.def("cppad_trace_graph_objective", cppad_trace_graph_objective);
+	m.def("cppad_trace_graph_objective", cppad_trace_graph_objective, nb::arg("graph"), nb::arg("aggregate") = true);
 	m.def("cppad_autodiff", &cppad_autodiff);
 }